Floor planing machine



Sept. 20, 1955 K. E. NORBERG 2,713,246

FLOOR PLANING MACHINE Filed March 8, I954 2 Sheets-Sheet l Sept. 20, 1955 K. E. NORBERG 2,713,246

FLOOR PLANING MACHINE 7 Filed March 8, 1954 2 Sheets-Sheet 2 United States Patent FLOOR PLANIN G MACHINE Knut E. Norberg, Bjasta, Sweden Application March 8, 1954, Serial No. 414,850

3 Claims. (Cl. 144-117) The present invention relates to a floor planing machine comprising a round cutter mounted at one end of the machine and driven by an electric motor, the working depth of said cutter being adjustable by means of a slidable bar arranged at either side of the cutter, which slidable bar rests against the floor during the operation.

According to the invention the slidable bars are individually adjustable in the vertical direction.

The invention is illustrated by an embodiment in the drawing in which Fig. 1 is a plan view of a floor planing machine according to the invention, certain parts of the machine being excluded for the sake of simplicity. Fig. 2 is a side view partly in section of the planing machine according to Fig. 1. Fig. 3 is a plan view from below corresponding to Fig. 1. Fig. 4 is a front view corresponding to Fig. 2, and Fig. 5 shows the machine the protective cover being applied.

In the drawing the reference numeral 1 designates a machine frame carrying an electric motor 23, a handle 69 being secured at their rear offset ends by means of a tube 64 to one end of the frame. The machine is supported on a chain roll 80 provided at the rear end of the frame and on two spaced wheels 82 provided at the forward portion of the frame, a round cutter being also mounted on the frame forward of the spaced wheels 82. When the rotary cutter 10 is not in use, the rear center roll 80 and front wheels 82 serve as means by which the machine can be wheeled i. e. transported from place to place. For adjusting the working depth of the cutter a slidable bar 32 is provided at either side of the cutter which bars rest against the floor during the operation, and which are secured to the frame 1 by hinges 81. Each slidable bar 32 is adjustable in the vertical direction by means of a screw 48 turnable in the frame 1 and operated by a knob 31 on the upper side of the machine. The adjustment is lockable by means of a device 30. In order to make the slidable bar sufiiciently stable in the lateral direction and that it shall not be elastic it is provided with a vertical spring running close to the outer side 46 of the frame.

The cutter 10 is a safety round cutter of wedge construction and it operates preferably at a speed of 6000 revolutions per minute. The cutter 10 is driven by the motor 23 by means of belts 25. In order to make it possible to tension the belts the motor 23 is placed on a shelf 24 which can be raised and lowered. For starting the motor a starting device 78, for example an Y-delta switch, is provided on the tube 64. The machine is also provided with belt protection housing 71 and cutter protection housing 36, which is provided with hinges for facilitating the change of cutter steel.

The wheels 82 are turnable backwards and upwards i. e. the wheels are retractable up into the machine frame for lowering the machine frame 1, cutter 10 and bars 32 so that the latter rest upon the floor and cutter 10 is placed in working position, by means of a fork construction (not shown). The fork construction can be operated by means of a handle and a connecting link 77. After the planing operation is complete, handle 65 is operated in the reverse direction to lower the wheels 82 thus raising cutter 10 and bars 32 off the floor.

Having now described my invention what I claim as new and desire to secure by Letters Patent is:

1. In a floor planing machine the combination comprising a frame, a motor driven rotary cutter mounted on said frame to rotate on a fixed axis, and a bar mounted on said frame at each side of said cutter, said bars being in contact with and slidable upon the floor when said cutter occupies its operative position with the cutting edge thereof a preselected distance below the plane containing the floor contacting surfaces of said bars, said distance determining the working depth of said cutter, and means for adjusting said bars individually in a vertical direction with respect to said frame and the fixed axis of rotation of said cutter to thereby effect a corresponding adjustment in the working depth of said cutter.

2. A floor planing machine as defined in claim 1 and which further includes wheel means on said frame, said wheel means projecting below said bars and cutter when said cutter occupies a non-operative transport position, and said wheel means being retractable into said frame thereby to lower said bars and cutter to an operative position resting upon the floor.

3. A floor planing machine as defined in claim 1 wherein said bars have their rear ends offset in the direction of said frame, the rear ends of said bars being secured to said frame, and the means for adjusting each said bar is constituted by a screw threadable in said frame and having the lower end of the screw secured to said bar.

References Cited in the file of this patent UNITED STATES PATENTS 76,791 Meriam Apr. 14, 1868 534,661 Parmelee et a1 Feb. 26, 1895 1,073,300 Solem Sept. 16, 1913 1,736,965 Carter NOV. 26, 1929 1,775,430 Hibbs Sept. 9, 1930 2,624,382 Moore Jan. 6, 1953 2,630,150 Lacelle Mar. 3, 1953 FOREIGN PATENTS 215,835 Great Britain May 15, 1924 

